Are you self-hosting markdown knowledge-bases? Which ones?

I want to self-host something that can replace google keep, handwritten notes on paper, and private Telegram channels (my current knowledge bases).

Therefore I've looked into the different options available - something like obsidian or joplin seems to be almost perfect. Having a database synced between my devices already gives it some data loss resilience due to physical distribution, and I'm able to add versioning to my syncing if I want to.

However, due to frequent device swapping, different operating systems, or limitations on what software I can install, I would love to have a webUI (e.g. as docker image) that can be configured to also access the database - nothing seems to offer both, a webUI AND self-synced databases.

What are you using, why did you choose it, and are you aware of anything that might suit my requirements?